Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/20224#discussion_r163456017
--- Diff:
sql/core/src/test/scala/org/apache/spark/sql/execution/WholeStageCodegenSuite.scala
---
@@ -228,4 +229,21 @@ class WholeStageCodegenSuite extends QueryTest with
SharedSQLContext {
}
}
}
+
+ test("including codegen stage ID in generated class name should not
regress codegen caching") {
+ import testImplicits._
+
+ withSQLConf(SQLConf.WHOLESTAGE_CODEGEN_USE_ID_IN_CLASS_NAME.key ->
"true") {
+ val bytecodeSizeHisto =
CodegenMetrics.METRIC_GENERATED_METHOD_BYTECODE_SIZE
+ spark.range(3).select('id + 2).collect
+ val after1 = bytecodeSizeHisto.getCount
+ spark.range(3).select('id + 2).collect
+ val after2 = bytecodeSizeHisto.getCount // same query shape as
above, deliberately
+ assert(after1 == after2, "the same query run twice should hit the
codegen cache")
+
+ spark.range(5).select('id * 2).collect
+ val after3 = bytecodeSizeHisto.getCount
+ assert(after3 >= after2, "a different query can result in codegen
cache miss, that's okay")
--- End diff --
makes sense
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